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Intensive Care Medicine Experimental
Fig. 3 | Intensive Care Medicine Experimental

Fig. 3

From: A high-flow nasal cannula system with relatively low flow effectively washes out CO2 from the anatomical dead space in a sophisticated respiratory model made by a 3D printer

Fig. 3

Capnograms and airway flows recorded. Capnograms were recorded with an HFNC flow of 10–60 L/min in each lung model. Airway flows were recorded without HFNC by the flow sensor in the lung model. There were no differences between the capnograms recorded at the subglottic and the inlet sites of the lung model, indicating the flow generated by HFNC does not reach further than the subglottic area. In open-mouth models, an HFNC flow of 10–20 L/min washed out the CO2 of the upper pharynx and the oral cavity. The closed-mouth model needed more HFNC flow to wash out the CO2 of the upper pharynx and the oral cavity

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